Improvement in buffing-mandrels



N. S. THOMPSON.

Buffing Mandrels.

No. 141,523 Patented August5,1873.

WITNESSES NVENTOK AM. Pnam-Lrr/msRAPh/c (:0. mt (osaomvs's macsss)UNITED STATES- PATENT QFFICE.

NATHANIEL S. THOMPSON, OF AUGUSTA, MAINE.

IMPROVEMENT IN BUFFlNG-MANDRELS.

Specification forming part of Letters Patent No. 141,523, dated August5, 1873; application filed April 1, 1873.

To all whom it may concern Be it known that I, NATHANIEL S. THOMP- soN,of Augusta, in the county of Kennebec and State of Maine, have inventedcertain new and useful Improvements in Sand-Pa per Wheels, of which thefollowing is a specification:

The nature of my invention consists in a new construction of asand-paper burr or wheel, the burr being so made that it may be openedlongitudinally through the center that is, divided into two parts, whichare each attached to a corresponding part of the mandrel. The mandrel,having a screw-thread out upon each end, and being slightly coned, isprovided with nuts, which, when screwed toward the end of the burr, willdraw the parts together and securely hold them. The object of theinvention is to afford a simple method of attaching the sand-paper tothe burr. This is done by screwing the nuts back and opening the burr,and inserting the ends between the two parts, after which they may beclosed together'and fastened by the nuts,

thus holding the paper.

Figure 1 is a perspective view of my invention. Fig. 2 is a perspectiveview, showing the parts open.

Let A B represent the shaft or mandrel upon which the sand-paper wheelis fixed. This mandrel is made, as indicated in Fig. 2, so that theparts 0 D fit into the parts 0 D at O D. The parts 0 D and A B formtogether a round spindle, and have a screw-thread out upon them, asshown, upon which the nuts N N fit. The ends D D and G O are slightlyconed, the larger part being toward E E, so that, as the nuts N N areturned on, the parts are drawn tightly together. E and E are twosemi-cylindrical blocks, attached together by a hinge at T T, Fig. 2,and made fast to the parts (J D and 0 D by screws or rivets, as shown inFig. 2. fff are small points inserted in the blocks E and E,- whichserve to assist in putting the paper on and in holding it.

The circumference of the wheel or burr may be covered by any suitablepadding, such as felt, rubber, &c. 7

To place the sand-paper on the wheel I have only to open it, as shown inFig. 2, then to carefully place a piece of properly-cut paper so thatthe end will lap over onto the pins fff. Now the parts may be closedtogether and the nuts N N screwed up, as shown in Fig. 1, and theinstrument is ready for use.

I claim as my invention- The combination of the sectional shaft 0 D O Dwith the blocks E E and nuts N N, substantially as described, and forthe purpose set forth.

NATHANIEL S. THOMPSON.

Witnesses:

FRANK G. PARKER, JOHN J. HALEY.

